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SQL WHERE ID IN (id1, id2, …, idn)
...this other table, insert your large number of rows, then perhaps create an index to aid the join performance. It would also let you detach the accumulation of these rows from the retrieval of data, perhaps giving you more options to tune performance.
Update: Although you could use a temporary table...
Convert command line arguments into an array in Bash
...ay, i.e. ${var[0]} ${var[1]} ... ${var[n]} (with nbeing the last element's index)?
– Christian
Sep 21 '16 at 18:27
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Programmer Puzzle: Encoding a chess board state throughout a game
Not strictly a question, more of a puzzle...
31 Answers
31
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jQuery trigger file input
...r;
position: absolute;
top: 0px;
right: 0px;
font-size: 100px;
z-index: 2;
opacity: 0.0; /* Standard: FF gt 1.5, Opera, Safari */
filter: alpha(opacity=0); /* IE lt 8 */
-ms-filter: "alpha(opacity=0)"; /* IE 8 */
-khtml-opacity: 0.0; /* Safari 1.x */
-moz-opacity: 0.0; /* FF lt ...
Insert auto increment primary key to existing table
... COLUMN mycolumnname INT NOT NULL AUTO_INCREMENT AFTER updated,
ADD UNIQUE INDEX mycolumnname_UNIQUE (mycolumname ASC);
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How to get child element by class name?
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@FranVerona Just out of curiosity, wouldn't a simple "indexOf('className') > -1" solve the multiple class issue?
– James Poulose
Jan 4 '15 at 23:33
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How can I fill a div with an image while keeping it proportional?
...in my case I just required to add position:absolute and top:0 , and some z-index as well
– byroncorrales
Feb 22 '17 at 0:23
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Delete everything in a MongoDB database
...whichever database>
db.getCollectionNames().forEach(function(c) { if (c.indexOf("system.") == -1) db[c].drop(); })
This code will go through all collection names from one database and drop those which do not start with "system.".
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How to delete a character from a string using Python
...ally removed from the list)
del(l[1]) # another way to delete it
p = l.index("a") # find position of the letter "a"
del(l[p]) # delete it
s = "".join(l) # convert back to string
You can also create a new string, as others have shown, by taking everything except the character you wan...
How to check whether a string contains a substring in Ruby
...eturns nil when the expression doesn't match. When it does, it returns the index of the character where the match happens. For example:
"foobar" =~ /bar/ # returns 3
"foobar" =~ /foo/ # returns 0
"foobar" =~ /zzz/ # returns nil
It's important to note that in Ruby only nil and the boolean expre...